Unless the person you emailed is in scheduling, they wouldn't really know anything. That person is probably just taking a look at the schedule and remarking on what you can already see for yourself.

Another possible explanation is that pmCO was much more aggressive in winter flying cutbacks than pmUA, and that may explain this January cutback. Further evidence of this is that sometime around the middle of Feb it appears that the day flights of LAX-CLE return to their usual 2 a day schedule.